Safety mechanism for elevators.



PATENTED MAR. 5, 1907. H. BAWDEN & W. HOSKIN.

SAFETY MECHANISM FOR ELEVATORS.

APPLICATION FILED JULY 6, 1906.

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PATENTED MAR. 5,1907. H. BAWDEN & W. HOSKIN.

SAFETY MECHANISM FOR ELEVATORS APPLIUATION'IILBD JULYG, 1906.

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Nosamss v H. BAWDEN & W. HOSKI SAFETY MECHANISM FOR ELEVATORS. APPLICATION FILED JULY 6,1906,

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PATENTED MAR. 5. 1907.

HERBERT BAWDEN AND WILLIAM HOSKIN, OF CENTRAL CITY, COLORADO,

ASSIGNORS OF ONE-THIRD TO HERBERT C. EASTMAN.

SAFETY MECHANISM FOR ELEVATORS- Specification of Letters Patent.

Patented March 5, 1907.

Original application filed October 14,1 905, Serial No. 28 2,805. Divided and this application filed July 6,1906 Serial No. 32 5 .017.

To all whom it may concern.

Be it known that we, HERBERT BAWDEN and WILLIAM Hosxnv, citizens of the United States, residing at Central City, in the county of Gilpin and State of Colorado, have invented certain new and useful Improvements in Safety Mechanism for Elevators; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled inthe art to which it appertains to make and use the same;

This invention relates to improvements in elevators, and more particularly to a safety mechanism therefor.

This is a divisional nal application, filed No! 282,805.

The object of means for cage in the event application of the origi- October 14, 1905, Serial of the invention is the provision facilitating the stopping of a of the same descendingaccidentally.

With this and other objects in view the invention consists of certain novel constructions, combinations, and arrangements of parts, as will be hereinafter fully described and claimed.

In the drawings, Figure 1 is a view in front elevation of a mechanism constructed in ac cordance with the present invention. Fig. 2 is a side view in elevation of the mechanism depicted in Fig. 1. Fig. 3 is a top plan view of the mechanism. Fig. 4 is an inverted plan view of the mechanism, showing the bottom of the structure. Fig. 5 is an enlarged view, in side elevation, of one of the key-plates. Fig. 6 is a view in side elevation of one of the slidable looking or catch members.

Referring to the drawings, 1 designates the platform of the cage, which is secured to the vertical beams 2 2, preferably I-beams. The I-beams 2, Fig. 3, are each provided with two sets of parallel flanges 3 and 4, respectively. Secured near the upper end of the vertical beams of the cage is a horizontal beam 5. The vertical guides of an ordinary elevator-well are positioned between the parallel flanges 4 4 of the I-beams 2. Brace-rods 5 are secured to each end of the platform and to the vertical I-bearns. Horizonta brace-rods 6 are secured near each end to the brace-rods 5 and engage the I-beams.

Slid able rods or members 7 are positioned 2 of the cage.

l force the drawhead 8 Fixedly secured by any suit able means to the upper end of the slidable rods 7 is a draw-head S. The draw-head 8 is preferably upwardly bowed intermediate its ends. A draw-head bolt 9 is slidably supported upon the cage-heam 5 and is connected centrally to the drawhead 8. The drawhead bolt 9 is provided with an aperture 10, Fig. 2. The apertured structure of the draw-head permits an ordinary lifting-cable (not shown) to be secured to the draw-head bolt. Vertical posts 11 are secured at their lower ends to the draw-head 8 and extend through apertures formed in the cage-beam 5. These bolts are capable of slidable movemerit within the cage-beam 5. Surrounding each of the posts 11 is yielding means-as, for instance, spring 12. These springs 12 normally exert downward pressure upon the draw-head 8, which pressure is overcome by the weight of the cage being normally sus pended upon the draw-head bolt 9. In the event of the lifting-cable being broken acci dentally the springs 12 will instantaneously and the rods 7 7 downward for actuating the safety devices.

Secured upon opposite sides of the elevator-cage are protecting-plates 13, which are bent at 14, Fig. 4, for spa-Ling the main portions from the sidesof the cage. The ends of each of the plates 13 are secured to the platform of the cage by any suitable fastening means. Secured to the lower end of each of the slidable rods 7 is a keyplate 15, Fig. 5, which performs the function of a cam for moving the locking devices. Each of the key-plates 15 is provided with elongated apertures 16 and with a vertical apertured extension key-plates are of wedge-shaped structure. Each of the protecting-plates 13 is provided with an elongated slot 18, which extends horizontally and longitudinally of the protecting-plate. Positioned below the platform or floor 1 and also below the parallel beams 19 of the cage are parallel movable shafts or rods 20. These shafts extend through the elongated slots 18 of the protecting-plates 13. The key-plates 15 are positioned between the side beams 19 and the protectingplates 13, Fig. 4. The shafts 20 not only 17. It will be noted that these of the protecting-plates, but also through the between the flanges 3 3 of the upright beams registering elongated apertures 16 of the keyplates, so that when the key-plates are vertically moved the shafts 20 will be moved laterally within the slots 18 of the protectingplates. Projecting outwardly from each of the protecting-plates 13 is preferably a pair of studs 21. Upon each of these studs 21 there is mounted a dog or pawl 22. A washer 21 is carried by each of the studs 21, between which and the protecting-plate 13 said dog or pawl is secured. Each of the shafts 20 extends at its opposite ends through the upper portions of two of the dogs 22. l Horizontal movement of the shafts 20 will cause the dogs 22 to be swung upon the studs 21. Upon one side of the cage each shaft 20 extendsthrough a key-plate 15, a protectingplate 13, and a pawl or dog 22. Vertical movement of the key-plates will cause the shafts 20 to be moved laterally relative to the cage and will consequently actuate the dogs. or pawls for removing the same from engagement with the ordinary elevatorguides between which the cage or carriage slides.

Slidable catches are carried by the cage, which are adapted to be projected beyond the sides for engaging a suitable stopas, for instance, a floorwhen the carriage is accidentally descending. Each of these slidable catches comprises a flat plate 23, which is provided with an auxiliary metallic reinforcing-plate 24. Preferably a pair of apertured ears 25 are mounted upon each of the shafts 20 between the parallel beams 19. Each. of the ears 25 is provided with a tapering hori zontal extension which engages the bottom of a plate 23. These ears 25 and plates 23 are fixedly connected by any suitable fastening meansas, for instance, bolts or rivets 26. The plates 23 and 24 are bifurcated, Figs. 3 and 4, producing extensions 27, j which are capable of being projected beyond the ends of the carriage or cage for engaging a floor as the cage descends in the well. 1 Blocks 28 are positioned beneath the platform 1 and are fixedly secured by any suitable meansas, for instance, rivets 29. These blocks limit the movement of the slid'able plates which constitute the longitudinallymovable catch devices. A transverse beam j 30 is secured between the parallel longitudi- I nal beams 19 below the platform 1. Bowed l springs 31 31 are secured centrally to the l transverse beam 30. The outer ends of each of said springs engage the inner end of a plate 23. These springs 31 not only force the slidable catches outward, but by reason of the connections between the plates 23 and the dogs or pawls 22 said dogs or pawls will j also be swung upon their pivot for causing the same to synchronously engage the guides when the longitudinal movable catches are projected for engaging stopsas, for instance, a floor. Downward projections 32 are formed upon a plate 33, which is secured i to the bottom of each of the beams 19. Between these parallel extensions or projections 32 the parallel movable shafts or rods 20 are positioned. These projections 32 limit the lateral movement of the shafts 20.

When the draw-head 8 moves downward, the key-plates 15, owing to the diverging elongated slots formed therein and assisted by the springs 31, will cause the horizontal shafts 20 to be moved apart, thereby sliding the outer ends of the plates 23 which are provided with the extensions 27 beyond the sides of the carriage or cage and also cause the pawls or dogs 22 to engage the vertical guides between which the cage slides.

What we claim is 1. The combination with an elevator-car, of oppositely-disposed key-plates carried by the car, a movable shaft loosely connected to the oppositely-disposed key-plates, a sliding catch having an operative connection with the shaft, and means for actuating the keyplates to control the movements of the catch.

2. The combination with an elevator-car, of parallel key-plates provided with elongated apertures, carried by said car, a movable shaft positioned within the apertured portions of said key-plates, means for actuating said key-plates for moving said shaft, and a slidable catch connected to said shaft.

3. The combination with an elevator-car,

of oppositely-disposed apertured key-plates carried by the said car, a movable shaft engaging with the apertures in the oppositelydisposed key-plates, a sliding catch having an operative connection with the movable shaft, and means for actuating the keyplates to control the movements of the catch.

4. The combination with an elevator-car, of oppositely disposed, slidably mounted key-plates carried by the said car, each of the key-plates being formed with a pair of apertures, a pair of movable shafts engaging with the apertures in the key-plates, sliding catches having an operative connection with the shafts, and means for actuating the keyplates to control the movements of the catches.

5. The combination with an elevator-car, of outwardly-bowed protecting-plates carried by said car, a movable shaft carried by said car and supported upon said protectingplates, key-plates interposed between said protecting-plates and said car, a catch secured to said shaft, and means for vertically moving said key-plates and thereby actuating said shaft and catch.

6. In a mechanism of the class described, the combination with an elevator-car, of horizontally-movable catches carried by said car, shafts secured to said catches, verticallymovable plates connecting said shafts, yielding means interposed between said catches, and means for actuating said plates and shafts.

7. The combination with an elevator-car, I necting means between the plates and the of oppositely-disposed slidably-mounted keyplates carried by the said car, each of the key-plates being formed with reversely-inclined elongated apertures, shafts connecting the key-plates and engaging with the apertures, catches having -an operative connection with the shafts, and means for actuating the key-plates to control the movements of the catches.

8. The combination with an elevator-car, of oppositely-disposed key-plates provided with reversely-inclined elongated apertures, and slidably mounted upon the said car, shafts connecting the oppositely-disposed key-plates and passin through the reverselyinclined apertures t erein, plates slidably mounted upon the bottom of the car, con

1 shafts, and means for actuating the key-plates to control the movements of the plates.

9. The combination with an elevator-car, of slidable catches carried by said car, vertically-movable key-plates carried by said car, means connecting said key-plates to said catches, and yielding means interposed between said catches and adapted to exert an outward pressure thereon.

In testimony whereof we affix our signatures in presence of two witnesses.

HERBERT BAWDEN. WILLIAM HOSKIN.

Witnesses:

JOHN C. FOWLER, WM. E. WITHROW. 

